This will be my first personal AR, but being military not new to them. I'm not sure if I should just buy a complete one from Colt, Rock River Arms, Palmetto State Armory, or if I should just build one. I know the Colt is the most expensive, but there is something that appeals to me about owning a Colt firearm. Both have their advantages and disadvantages. So if you have any thoughts or expierence with one of the above mentioned companies, some feedback would be great. Thank you.